PROBING THE OUTER GALACTIC HALO WITH RR LYRAE FROM THE CATALINA SURVEYS
PROBING THE OUTER GALACTIC HALO WITH RR LYRAE FROM THE CATALINA SURVEYS
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DOI：
10.1088/0004-637x/763/1/32
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
A. Drake;M. Catelán;S. Djorgovski;G. Torrealba;M. Graham;V. Belokurov;Sergey E. Koposov;A. Mahabal-A.-Maha
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作者：
A. Drake;M. Catelán;S. Djorgovski;G. Torrealba;M. Graham;V. Belokurov;Sergey E. Koposov;A. Mahabal-A.-Maha
我们分析了卡塔利纳调查数据发布1中的2亿条公共光变曲线中发现的12，227个ab型RR天琴座（RRL）。这些恒星跨越了有史以来用RRL测量的银河系的最大体积，覆盖了20，000平方度的天空（RRL的0° 1500。使用精确的距离推导出的RRL，我们显示的路径人马座潮汐流穿越天空的日心距离从20至60千秒差距。通过选择银河系晕RRL的样本，我们比较它们的速度，金属丰度和距离从最近的详细的人马座系统的N体模型的预测。我们发现，预测的距离和结构与我们的观测结果之间存在一些显着差异。
We present analysis of 12,227 type-ab RR Lyraes (RRLs) found among the 200 million public light curves in Catalina Surveys Data Release 1. These stars span the largest volume of the Milky Way ever surveyed with RRLs, covering ∼20,000 deg2 of the sky (0° 1500 of the RRLs. Using the accurate distances derived for the RRLs, we show the paths of the Sagittarius tidal streams crossing the sky at heliocentric distances from 20 to 60 kpc. By selecting samples of Galactic halo RRLs, we compare their velocity, metallicity, and distance with predictions from a recent detailed N-body model of the Sagittarius system. We find that there are some significant differences between the distances and structures predicted and our observations.